I bought it for professional use on citrus and olive trees. First test today and apart from being light and relatively comfortable on the back with reinforced straps, I think I wasted my money on a (not exactly cheap) sprayer that wastes chemicals, etc. The negatives are: 1) To get the liquid out when I first filled it, I had to make many attempts to suck the air out of the plastic tube. Luckily I had read about it from others and had only put water. 2) The switch of the flow regulator comes out very easily and can be lost. Also, the lid cannot be closed while it is in place. 3) With the flow regulator closed, I sprayed the first time with herbicide 16 liters, at the lowest pressure with the single nozzle and it emptied in 10 minutes or less. 4) The filter that goes inside constantly came out of its place. I want to believe that there was a greater liquid dispersion when the filter was not in place and that this can be solved with Teflon tape. 5) I sprayed a total of 42 liters of solution, that is, it worked for about 30 minutes and the battery indicator was green. Note that it is supposed to last for about 5 hours. After cleaning the tank, etc., I put it to charge and it took about 2 hours to change the light on the charger from red to blue, indicating that the charging was complete. The first charge had lasted about 3 hours with an empty battery. So proportionally something is wrong with the promised battery life.
6) With the old alkaline battery sprayer with 20 liters I sprayed around 700 mandarin trees. Today with 42 liters it is doubtful if I sprayed half of the same trees! Needless to say how much the cost increases in chemicals, which are already very expensive. 7) You cannot see the level of the remaining liquid, only if you open it from the top. 8) The build quality, except for the straps and the additional plastic for the back & waist, is just mediocre. I believe that if, God forbid, it falls full, the hard plastic will break into pieces. 9) At the bottom where the battery and pump motor are located, there are openings (grilles) in the plastic obviously for ventilation and a small plastic cover. No protection. In case water enters, because for example we left it on wet ground or water fell during filling, I do not believe there will be salvation...
10) The user instructions are only in English with such tiny letters that I had to enlarge them to A3 to be able to read them. They did not enlighten me on anything.
The 2 stars are only for the comfort on the back, the reinforced straps, and the nice color.
If it continues like this, the only use of it will be to pass with copper/sulfur on the trunks or for bait spraying. I will come back if something changes. I really wonder about those who rate this product with 5 stars.
Update 20/4/2024: For those who use it for a/c cleaning, I have no opinion. For those who buy it for their balcony or garden plants, I believe there are more economical solutions. For professional farmers, unfortunately, it is not worth it. I only use it for bait spraying now.